/Engine/Source/Runtime/GeometryCore/Public/DynamicMeshEditor.h
If an entry of TriVidPairs1 resolves to verts [a,b] and the corresponding pair of verts in VertexLoop2 are [c,d], then tris added are [b,a,d] and [a,c,d].
true if operation succeeded. If a failure occurs, any added triangles are removed via RemoveTriangles
bool StitchVertexLoopToTriVidPairSequence ( const [TArray](API\Runtime\Core\Containers\TArray)< TPair< int32, TPair< int8, int8 >>> & TriVidPairs1, const [TArray](API\Runtime\Core\Containers\TArray)< int > & VertexLoop2, [FDynamicMeshEditResult](API\Runtime\GeometryCore\FDynamicMeshEditResult) & ResultOut )